I'm sure this is going to be something simple. I have a small Splunk POC environment consisting of a cluster master, 3 indexers, and 2 search heads. When pulling up the DMC on the master, I see all 3 indexers, itself (the master), and 1 search head. But the other search head never shows up. I've even erased and reinstalled Spunk on this search head to no avail. It IS reporting to the license server, and I can search my data with it. Just can't see it in DMC.
solution is right @ aaraneta
...and you are hosting the DMC on an instance other than the cluster master, you must add the cluster master as a search peer.
Works very well!
Did you manually add that search-head as a search peer on the DMC / Cluster Master instance? This is a required step:
Repeat steps 3 and 4 for each search head, deployment server, license master, and nonclustered indexer. Do not add clustered indexers, but you must add clustered search heads.